/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Generic socket support routines. Memory allocators, socket lock/release * handler for protocols to use and generic option handler. * * * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $ * * Authors: Ross Biro * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Florian La Roche, <flla@stud.uni-sb.de> * Alan Cox, <A.Cox@swansea.ac.uk> * * Fixes: * Alan Cox : Numerous verify_area() problems * Alan Cox : Connecting on a connecting socket * now returns an error for tcp. * Alan Cox : sock->protocol is set correctly. * and is not sometimes left as 0. * Alan Cox : connect handles icmp errors on a * connect properly. Unfortunately there * is a restart syscall nasty there. I * can't match BSD without hacking the C * library. Ideas urgently sought! * Alan Cox : Disallow bind() to addresses that are * not ours - especially broadcast ones!! * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, * instead they leave that for the DESTROY timer. * Alan Cox : Clean up error flag in accept * Alan Cox : TCP ack handling is buggy, the DESTROY timer * was buggy. Put a remove_sock() in the handler * for memory when we hit 0. Also altered the timer * code. The ACK stuff can wait and needs major * TCP layer surgery. * Alan Cox : Fixed TCP ack bug, removed remove sock * and fixed timer/inet_bh race. * Alan Cox : Added zapped flag for TCP * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... * Rick Sladkey : Relaxed UDP rules for matching packets. * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support * Pauline Middelink : identd support * Alan Cox : Fixed connect() taking signals I think. * Alan Cox : SO_LINGER supported * Alan Cox : Error reporting fixes * Anonymous : inet_create tidied up (sk->reuse setting) * Alan Cox : inet sockets don't set sk->type! * Alan Cox : Split socket option code * Alan Cox : Callbacks * Alan Cox : Nagle flag for Charles & Johannes stuff * Alex : Removed restriction on inet fioctl * Alan Cox : Splitting INET from NET core * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code * Alan Cox : Split IP from generic code * Alan Cox : New kfree_skbmem() * Alan Cox : Make SO_DEBUG superuser only. * Alan Cox : Allow anyone to clear SO_DEBUG * (compatibility fix) * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. * Alan Cox : Allocator for a socket is settable. * Alan Cox : SO_ERROR includes soft errors. * Alan Cox : Allow NULL arguments on some SO_ opts * Alan Cox : Generic socket allocation to make hooks * easier (suggested by Craig Metz). * Michael Pall : SO_ERROR returns positive errno again * Steve Whitehouse: Added default destructor to free * protocol private data. * Steve Whitehouse: Added various other default routines * common to several socket families. * Chris Evans : Call suser() check last on F_SETOWN * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() * Andi Kleen : Fix write_space callback * Chris Evans : Security fixes - signedness again * Arnaldo C. Melo : cleanups, use skb_queue_purge * * To Fix: * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/capability.h>#include <linux/config.h>#include <linux/errno.h>#include <linux/types.h>#include <linux/socket.h>#include <linux/in.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/sched.h>#include <linux/timer.h>#include <linux/string.h>#include <linux/sockios.h>#include <linux/net.h>#include <linux/mm.h>#include <linux/slab.h>#include <linux/interrupt.h>#include <linux/poll.h>#include <linux/tcp.h>#include <linux/init.h> #include <asm/uaccess.h>#include <asm/system.h> #include <linux/netdevice.h>#include <net/protocol.h>#include <linux/skbuff.h>#include <net/request_sock.h>#include <net/sock.h>#include <net/xfrm.h>#include <linux/ipsec.h> #include <linux/filter.h> #ifdef CONFIG_INET#include <net/tcp.h>#endif /* Take into consideration the size of the struct sk_buff overhead in the * determination of these values, since that is non-constant across * platforms. This makes socket queueing behavior and performance * not depend upon such differences. */#define _SK_MEM_PACKETS 256#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) /* Run time adjustable parameters. */__u32 sysctl_wmem_max = SK_WMEM_MAX;__u32 sysctl_rmem_max = SK_RMEM_MAX;__u32 sysctl_wmem_default = SK_WMEM_MAX;__u32 sysctl_rmem_default = SK_RMEM_MAX; /* Maximal space eaten by iovec or ancilliary data plus some space */int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512); static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen){ struct timeval tv; if (optlen < sizeof(tv)) return -EINVAL; if (copy_from_user(&tv, optval, sizeof(tv))) return -EFAULT; *timeo_p = MAX_SCHEDULE_TIMEOUT; if (tv.tv_sec == 0 && tv.tv_usec == 0) return 0; if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); return 0;} static void sock_warn_obsolete_bsdism(const char *name){ static int warned; static char warncomm[TASK_COMM_LEN]; if (strcmp(warncomm, current->comm) && warned < 5) { strcpy(warncomm, current->comm); printk(KERN_WARNING "process `%s' is using obsolete " "%s SO_BSDCOMPAT\n", warncomm, name); warned++; }} static void sock_disable_timestamp(struct sock *sk){ if (sock_flag(sk, SOCK_TIMESTAMP)) { sock_reset_flag(sk, SOCK_TIMESTAMP); net_disable_timestamp(); }} int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb){ int err = 0; int skb_len; /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces number of warnings when compiling with -W --ANK */ if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= (unsigned)sk->sk_rcvbuf) { err = -ENOMEM; goto out; } /* It would be deadlock, if sock_queue_rcv_skb is used with socket lock! We assume that users of this function are lock free. */ err = sk_filter(sk, skb, 1); if (err) goto out; skb->dev = NULL; skb_set_owner_r(skb, sk); /* Cache the SKB length before we tack it onto the receive * queue. Once it is added it no longer belongs to us and * may be freed by other threads of control pulling packets * from the queue. */ skb_len = skb->len; skb_queue_tail(&sk->sk_receive_queue, skb); if (!sock_flag(sk, SOCK_DEAD)) sk->sk_data_ready(sk, skb_len);out: return err;}EXPORT_SYMBOL(sock_queue_rcv_skb); int sk_receive_skb(struct sock *sk, struct sk_buff *skb){ int rc = NET_RX_SUCCESS; if (sk_filter(sk, skb, 0)) goto discard_and_relse; skb->dev = NULL; bh_lock_sock(sk); if (!sock_owned_by_user(sk)) rc = sk->sk_backlog_rcv(sk, skb); else sk_add_backlog(sk, skb); bh_unlock_sock(sk);out: sock_put(sk); return rc;discard_and_relse: kfree_skb(skb); goto out;}EXPORT_SYMBOL(sk_receive_skb); struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie){ struct dst_entry *dst = sk->sk_dst_cache; if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { sk->sk_dst_cache = NULL; dst_release(dst); return NULL; } return dst;}EXPORT_SYMBOL(__sk_dst_check); struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie){ struct dst_entry *dst = sk_dst_get(sk); if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { sk_dst_reset(sk); dst_release(dst); return NULL; } return dst;}EXPORT_SYMBOL(sk_dst_check); /* * This is meant for all protocols to use and covers goings on * at the socket level. Everything here is generic. */ int sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen){ struct sock *sk=sock->sk; struct sk_filter *filter; int val; int valbool; struct linger ling; int ret = 0; /* * Options without arguments */ #ifdef SO_DONTLINGER /* Compatibility item... */ if (optname == SO_DONTLINGER) { lock_sock(sk); sock_reset_flag(sk, SOCK_LINGER); release_sock(sk); return 0; }#endif if(optlen<sizeof(int)) return(-EINVAL); if (get_user(val, (int __user *)optval)) return -EFAULT; valbool = val?1:0; lock_sock(sk); switch(optname) { case SO_DEBUG: if(val && !capable(CAP_NET_ADMIN)) { ret = -EACCES; } else if (valbool) sock_set_flag(sk, SOCK_DBG); else sock_reset_flag(sk, SOCK_DBG); break; case SO_REUSEADDR: sk->sk_reuse = valbool; break; case SO_TYPE: case SO_ERROR: ret = -ENOPROTOOPT; break; case SO_DONTROUTE: if (valbool) sock_set_flag(sk, SOCK_LOCALROUTE); else sock_reset_flag(sk, SOCK_LOCALROUTE); break; case SO_BROADCAST: sock_valbool_flag(sk, SOCK_BROADCAST, valbool); break; case SO_SNDBUF: /* Don't error on this BSD doesn't and if you think about it this is right. Otherwise apps have to play 'guess the biggest size' games. RCVBUF/SNDBUF are treated in BSD as hints */ if (val > sysctl_wmem_max) val = sysctl_wmem_max;set_sndbuf: sk->sk_userlocks |= SOCK_SNDBUF_LOCK; if ((val * 2) < SOCK_MIN_SNDBUF) sk->sk_sndbuf = SOCK_MIN_SNDBUF; else sk->sk_sndbuf = val * 2; /* * Wake up sending tasks if we * upped the value. */ sk->sk_write_space(sk); break; case SO_SNDBUFFORCE: if (!capable(CAP_NET_ADMIN)) { ret = -EPERM; break; } goto set_sndbuf; case SO_RCVBUF: /* Don't error on this BSD doesn't and if you think about it this is right. Otherwise apps have to play 'guess the biggest size' games. RCVBUF/SNDBUF are treated in BSD as hints */ if (val > sysctl_rmem_max) val = sysctl_rmem_max;set_rcvbuf: sk->sk_userlocks |= SOCK_RCVBUF_LOCK; /* * We double it on the way in to account for * "struct sk_buff" etc. overhead. Applications * assume that the SO_RCVBUF setting they make will * allow that much actual data to be received on that * socket. * * Applications are unaware that "struct sk_buff" and * other overheads allocate from the receive buffer * during socket buffer allocation. * * And after considering the possible alternatives, * returning the value we actually used in getsockopt * is the most desirable behavior. */ if ((val * 2) < SOCK_MIN_RCVBUF) sk->sk_rcvbuf = SOCK_MIN_RCVBUF; else sk->sk_rcvbuf = val * 2; break; case SO_RCVBUFFORCE: if (!capable(CAP_NET_ADMIN)) { ret = -EPERM; break; } goto set_rcvbuf; case SO_KEEPALIVE:#ifdef CONFIG_INET if (sk->sk_protocol == IPPROTO_TCP) tcp_set_keepalive(sk, valbool);#endif sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); break; case SO_OOBINLINE: sock_valbool_flag(sk, SOCK_URGINLINE, valbool); break; case SO_NO_CHECK: sk->sk_no_check = valbool; break; case SO_PRIORITY: if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) sk->sk_priority = val; else ret = -EPERM; break; case SO_LINGER: if(optlen<sizeof(ling)) { ret = -EINVAL; /* 1003.1g */ break; } if (copy_from_user(&ling,optval,sizeof(ling))) { ret = -EFAULT; break; } if (!ling.l_onoff) sock_reset_flag(sk, SOCK_LINGER); else {#if (BITS_PER_LONG == 32) if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; else#endif sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; sock_set_flag(sk, SOCK_LINGER); } break; case SO_BSDCOMPAT: sock_warn_obsolete_bsdism("setsockopt"); break; case SO_PASSCRED: if (valbool) set_bit(SOCK_PASSCRED, &sock->flags); else clear_bit(SOCK_PASSCRED, &sock->flags); break; case SO_TIMESTAMP: if (valbool) { sock_set_flag(sk, SOCK_RCVTSTAMP); sock_enable_timestamp(sk); } else sock_reset_flag(sk, SOCK_RCVTSTAMP); break; case SO_RCVLOWAT: if (val < 0) val = INT_MAX; sk->sk_rcvlowat = val ? : 1; break; case SO_RCVTIMEO: ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); break; case SO_SNDTIMEO: ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); break; #ifdef CONFIG_NETDEVICES case SO_BINDTODEVICE: { char devname[IFNAMSIZ]; /* Sorry... */ if (!capable(CAP_NET_RAW)) {Lines 1–500 of 1872. 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/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Generic socket support routines. Memory allocators, socket lock/release * handler for protocols to use and generic option handler. * * * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $ * * Authors: Ross Biro * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Florian La Roche, <flla@stud.uni-sb.de> * Alan Cox, <A.Cox@swansea.ac.uk> * * Fixes: * Alan Cox : Numerous verify_area() problems * Alan Cox : Connecting on a connecting socket * now returns an error for tcp. * Alan Cox : sock->protocol is set correctly. * and is not sometimes left as 0. * Alan Cox : connect handles icmp errors on a * connect properly. Unfortunately there * is a restart syscall nasty there. I * can't match BSD without hacking the C * library. Ideas urgently sought! * Alan Cox : Disallow bind() to addresses that are * not ours - especially broadcast ones!! * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, * instead they leave that for the DESTROY timer. * Alan Cox : Clean up error flag in accept * Alan Cox : TCP ack handling is buggy, the DESTROY timer * was buggy. Put a remove_sock() in the handler * for memory when we hit 0. Also altered the timer * code. The ACK stuff can wait and needs major * TCP layer surgery. * Alan Cox : Fixed TCP ack bug, removed remove sock * and fixed timer/inet_bh race. * Alan Cox : Added zapped flag for TCP * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... * Rick Sladkey : Relaxed UDP rules for matching packets. * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support * Pauline Middelink : identd support * Alan Cox : Fixed connect() taking signals I think. * Alan Cox : SO_LINGER supported * Alan Cox : Error reporting fixes * Anonymous : inet_create tidied up (sk->reuse setting) * Alan Cox : inet sockets don't set sk->type! * Alan Cox : Split socket option code * Alan Cox : Callbacks * Alan Cox : Nagle flag for Charles & Johannes stuff * Alex : Removed restriction on inet fioctl * Alan Cox : Splitting INET from NET core * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code * Alan Cox : Split IP from generic code * Alan Cox : New kfree_skbmem() * Alan Cox : Make SO_DEBUG superuser only. * Alan Cox : Allow anyone to clear SO_DEBUG * (compatibility fix) * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. * Alan Cox : Allocator for a socket is settable. * Alan Cox : SO_ERROR includes soft errors. * Alan Cox : Allow NULL arguments on some SO_ opts * Alan Cox : Generic socket allocation to make hooks * easier (suggested by Craig Metz). * Michael Pall : SO_ERROR returns positive errno again * Steve Whitehouse: Added default destructor to free * protocol private data. * Steve Whitehouse: Added various other default routines * common to several socket families. * Chris Evans : Call suser() check last on F_SETOWN * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() * Andi Kleen : Fix write_space callback * Chris Evans : Security fixes - signedness again * Arnaldo C. Melo : cleanups, use skb_queue_purge * * To Fix: * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/capability.h> #include <linux/config.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/interrupt.h> #include <linux/poll.h> #include <linux/tcp.h> #include <linux/init.h> #include <asm/uaccess.h> #include <asm/system.h> #include <linux/netdevice.h> #include <net/protocol.h> #include <linux/skbuff.h> #include <net/request_sock.h> #include <net/sock.h> #include <net/xfrm.h> #include <linux/ipsec.h> #include <linux/filter.h> #ifdef CONFIG_INET #include <net/tcp.h> #endif /* Take into consideration the size of the struct sk_buff overhead in the * determination of these values, since that is non-constant across * platforms. This makes socket queueing behavior and performance * not depend upon such differences. */ #define _SK_MEM_PACKETS 256 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) /* Run time adjustable parameters. */ __u32 sysctl_wmem_max = SK_WMEM_MAX; __u32 sysctl_rmem_max = SK_RMEM_MAX; __u32 sysctl_wmem_default = SK_WMEM_MAX; __u32 sysctl_rmem_default = SK_RMEM_MAX; /* Maximal space eaten by iovec or ancilliary data plus some space */ int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512); static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) { struct timeval tv; if (optlen < sizeof(tv)) return -EINVAL; if (copy_from_user(&tv, optval, sizeof(tv))) return -EFAULT; *timeo_p = MAX_SCHEDULE_TIMEOUT; if (tv.tv_sec == 0 && tv.tv_usec == 0) return 0; if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); return 0; } static void sock_warn_obsolete_bsdism(const char *name) { static int warned; static char warncomm[TASK_COMM_LEN]; if (strcmp(warncomm, current->comm) && warned < 5) { strcpy(warncomm, current->comm); printk(KERN_WARNING "process `%s' is using obsolete " "%s SO_BSDCOMPAT\n", warncomm, name); warned++; } } static void sock_disable_timestamp(struct sock *sk) { if (sock_flag(sk, SOCK_TIMESTAMP)) { sock_reset_flag(sk, SOCK_TIMESTAMP); net_disable_timestamp(); } } int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) { int err = 0; int skb_len; /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces number of warnings when compiling with -W --ANK */ if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= (unsigned)sk->sk_rcvbuf) { err = -ENOMEM; goto out; } /* It would be deadlock, if sock_queue_rcv_skb is used with socket lock! We assume that users of this function are lock free. */ err = sk_filter(sk, skb, 1); if (err) goto out; skb->dev = NULL; skb_set_owner_r(skb, sk); /* Cache the SKB length before we tack it onto the receive * queue. Once it is added it no longer belongs to us and * may be freed by other threads of control pulling packets * from the queue. */ skb_len = skb->len; skb_queue_tail(&sk->sk_receive_queue, skb); if (!sock_flag(sk, SOCK_DEAD)) sk->sk_data_ready(sk, skb_len); out: return err; } EXPORT_SYMBOL(sock_queue_rcv_skb); int sk_receive_skb(struct sock *sk, struct sk_buff *skb) { int rc = NET_RX_SUCCESS; if (sk_filter(sk, skb, 0)) goto discard_and_relse; skb->dev = NULL; bh_lock_sock(sk); if (!sock_owned_by_user(sk)) rc = sk->sk_backlog_rcv(sk, skb); else sk_add_backlog(sk, skb); bh_unlock_sock(sk); out: sock_put(sk); return rc; discard_and_relse: kfree_skb(skb); goto out; } EXPORT_SYMBOL(sk_receive_skb); struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) { struct dst_entry *dst = sk->sk_dst_cache; if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { sk->sk_dst_cache = NULL; dst_release(dst); return NULL; } return dst; } EXPORT_SYMBOL(__sk_dst_check); struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) { struct dst_entry *dst = sk_dst_get(sk); if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { sk_dst_reset(sk); dst_release(dst); return NULL; } return dst; } EXPORT_SYMBOL(sk_dst_check); /* * This is meant for all protocols to use and covers goings on * at the socket level. Everything here is generic. */ int sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) { struct sock *sk=sock->sk; struct sk_filter *filter; int val; int valbool; struct linger ling; int ret = 0; /* * Options without arguments */ #ifdef SO_DONTLINGER /* Compatibility item... */ if (optname == SO_DONTLINGER) { lock_sock(sk); sock_reset_flag(sk, SOCK_LINGER); release_sock(sk); return 0; } #endif if(optlen<sizeof(int)) return(-EINVAL); if (get_user(val, (int __user *)optval)) return -EFAULT; valbool = val?1:0; lock_sock(sk); switch(optname) { case SO_DEBUG: if(val && !capable(CAP_NET_ADMIN)) { ret = -EACCES; } else if (valbool) sock_set_flag(sk, SOCK_DBG); else sock_reset_flag(sk, SOCK_DBG); break; case SO_REUSEADDR: sk->sk_reuse = valbool; break; case SO_TYPE: case SO_ERROR: ret = -ENOPROTOOPT; break; case SO_DONTROUTE: if (valbool) sock_set_flag(sk, SOCK_LOCALROUTE); else sock_reset_flag(sk, SOCK_LOCALROUTE); break; case SO_BROADCAST: sock_valbool_flag(sk, SOCK_BROADCAST, valbool); break; case SO_SNDBUF: /* Don't error on this BSD doesn't and if you think about it this is right. Otherwise apps have to play 'guess the biggest size' games. RCVBUF/SNDBUF are treated in BSD as hints */ if (val > sysctl_wmem_max) val = sysctl_wmem_max; set_sndbuf: sk->sk_userlocks |= SOCK_SNDBUF_LOCK; if ((val * 2) < SOCK_MIN_SNDBUF) sk->sk_sndbuf = SOCK_MIN_SNDBUF; else sk->sk_sndbuf = val * 2; /* * Wake up sending tasks if we * upped the value. */ sk->sk_write_space(sk); break; case SO_SNDBUFFORCE: if (!capable(CAP_NET_ADMIN)) { ret = -EPERM; break; } goto set_sndbuf; case SO_RCVBUF: /* Don't error on this BSD doesn't and if you think about it this is right. Otherwise apps have to play 'guess the biggest size' games. RCVBUF/SNDBUF are treated in BSD as hints */ if (val > sysctl_rmem_max) val = sysctl_rmem_max; set_rcvbuf: sk->sk_userlocks |= SOCK_RCVBUF_LOCK; /* * We double it on the way in to account for * "struct sk_buff" etc. overhead. Applications * assume that the SO_RCVBUF setting they make will * allow that much actual data to be received on that * socket. * * Applications are unaware that "struct sk_buff" and * other overheads allocate from the receive buffer * during socket buffer allocation. * * And after considering the possible alternatives, * returning the value we actually used in getsockopt * is the most desirable behavior. */ if ((val * 2) < SOCK_MIN_RCVBUF) sk->sk_rcvbuf = SOCK_MIN_RCVBUF; else sk->sk_rcvbuf = val * 2; break; case SO_RCVBUFFORCE: if (!capable(CAP_NET_ADMIN)) { ret = -EPERM; break; } goto set_rcvbuf; case SO_KEEPALIVE: #ifdef CONFIG_INET if (sk->sk_protocol == IPPROTO_TCP) tcp_set_keepalive(sk, valbool); #endif sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); break; case SO_OOBINLINE: sock_valbool_flag(sk, SOCK_URGINLINE, valbool); break; case SO_NO_CHECK: sk->sk_no_check = valbool; break; case SO_PRIORITY: if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) sk->sk_priority = val; else ret = -EPERM; break; case SO_LINGER: if(optlen<sizeof(ling)) { ret = -EINVAL; /* 1003.1g */ break; } if (copy_from_user(&ling,optval,sizeof(ling))) { ret = -EFAULT; break; } if (!ling.l_onoff) sock_reset_flag(sk, SOCK_LINGER); else { #if (BITS_PER_LONG == 32) if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; else #endif sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; sock_set_flag(sk, SOCK_LINGER); } break; case SO_BSDCOMPAT: sock_warn_obsolete_bsdism("setsockopt"); break; case SO_PASSCRED: if (valbool) set_bit(SOCK_PASSCRED, &sock->flags); else clear_bit(SOCK_PASSCRED, &sock->flags); break; case SO_TIMESTAMP: if (valbool) { sock_set_flag(sk, SOCK_RCVTSTAMP); sock_enable_timestamp(sk); } else sock_reset_flag(sk, SOCK_RCVTSTAMP); break; case SO_RCVLOWAT: if (val < 0) val = INT_MAX; sk->sk_rcvlowat = val ? : 1; break; case SO_RCVTIMEO: ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); break; case SO_SNDTIMEO: ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); break; #ifdef CONFIG_NETDEVICES case SO_BINDTODEVICE: { char devname[IFNAMSIZ]; /* Sorry... */ if (!capable(CAP_NET_RAW)) {